* {
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

.left_nav {
    background-color: rgb(46, 45, 62);
    height: 100%;
    width: 200px;
    position: fixed;
}

.clearfix::after {
    clear: both;
    display: block;
    content: "";
}

.left_nav .head {
    border-bottom: 2px solid gray;
    padding-top: 20px;
    padding-bottom: 20px;
}

.left_nav .head .head_icon {
    background: url(../images/money.png);
    width: 30px;
    height: 30px;
    background-size: cover;
    float: left;
    margin-left: 20px;
    margin-right: 30px;
}

.left_nav .head .head_word {
    height: 30px;
    float: left;
    line-height: 30px;
    color: white;
    font-weight: bolder;
}

.left_nav ul {
    padding-top: 30px;
}

.left_nav ul li {
    position: relative;
    list-style: none;
    padding-left: 75px;
    margin-bottom: 35px;
    color: white;
    font-weight: bolder;
    line-height: 25px;
    cursor: pointer;
}

.left_nav ul li span {
    width: 25px;
    height: 25px;
    position: absolute;
    top: 0;
    left: 20px;
    background: url(https://images-1300275660.cos.ap-shanghai.myqcloud.com/%E7%90%86%E8%B4%A2.png) no-repeat center;
    background-size: cover;
}

.left_nav .second_icon {
    background: url(../images/余额.png);
    background-size: cover;
}

.left_nav .third_icon {
    background: url(../images/支付.png);
    background-size: cover;
}

.left_nav .fourth_icon {
    background: url(../images/记账.png);
    background-size: cover;
}

.left_nav .fifth_icon {
    background: url(../images/筛选.png);
    background-size: cover;
}